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NML Cygni
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NML Cygni
H-Alpha light image of Cygnus OB2, the stellar association in which NML Cygni is located
Observation data
Epoch J2000 Equinox J2000
Constellation
Cygnus
Right ascension
20h 46m 25.6s
Declination
+40° 06' 59.4?
Apparent magnitude (V)
16.60
Characteristics
Spectral type
M6I
B-V color index
2.0
Variable type
Semiregular
Astrometry
Proper motion (µ)
RA: -1.55 mas/yr
Dec.: -4.59 mas/yr
Parallax (p)
0.620 ± 0.047 mas
Distance
1.61k pc
Details
Mass
25–40 M?
Radius
1,642–2,775 R?
Luminosity
270,000 L?
Other designations
Database references
SIMBAD
data
NML Cygni or V1489 Cygni is a red hypergiant and one of the largest stars currently known with a radius about 1,650 times the Sun's, equal to 7.67 astronomical units. Its distance from Earth is estimated to be around 1.6 kpc, or about 5,300 light-years.NML Cygni is a part of the Cygnus OB2 association, one of the closest massive associations to the Sun spanning nearly 2° on the sky, or ~30 pc in radius at the distance of 1.74 ± 0.2 kpc.
^ Monnier, J. D.; Millan-Gabet, R.; Tuthill, P. G.; Traub, W. A.; Carleton, N. P.; Coude Du Foresto, V.; Danchi, W. C.; Lacasse, M. G.; Morel, S.; Perrin, G.; Porro, I. L.; Schloerb, F. P.; Townes, C. H. (2004). "High-Resolution Imaging of Dust Shells by Using Keck Aperture Masking and the IOTA Interferometer". The Astrophysical Journal 605: 436. arXiv:astro-ph/0401363. Bibcode:2004ApJ...605..436M. doi:10.1086/382218. edit
^ a b c d e f g h i Zhang, B.; Reid, M. J.; Menten, K. M.; Zheng, X. W.; Brunthaler, A. (2012). "The distance and size of the red hypergiant NML Cygni from VLBA and VLA astrometry". Astronomy & Astrophysics 544: A42. arXiv:1207.1850. Bibcode:2012A&A...544A..42Z. doi:10.1051/0004-6361/201219587. edit
^ a b Schuster, Michael Thomas (2007). Investigating the Circumstellar Environments of the Cool Hypergiants. ProQuest. p. 57. ISBN 978-0-549-32782-0. Retrieved 27 August 2012.
^ Cite error: The named reference Imaging_the_Cool_Hypergiant_NML_Cygni.E2.80.99s_Dusty_Circumstellar_Envelope_with_Adaptive_Optics was invoked but never defined (see the help page).
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